Question
Angiosperm flowers may be monoecious, cleistogamous or show self-incompatibility. Describe the characteristic features of each one of them and state which one of these flowers promotes inbreeding and outbreeding respectively.
✓
Answer
- Monoecious refers to the condition, where a plant bears both male and female flowers or bisexual flowers.
- Cleistogamous flowers are those bisexual flowers which do not open at all even at maturity; they are invariably autogamous.
- Self-incompatibility is the genetic mechanism that prevents the self-pollen from fertilising the ovules.
- Cleistogamous flowers promote inbreeding and self-incompatibility promotes outbreeding.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
What are the methods of cancer detection? Describe the common approaches for treatment of cancer.
What do you understand by Parturition? Discuss the parturition and lactation process in human.
Answer the following questions:
How is ‘oogenesis’ markedly different from ‘spermatogenesis’ with respect to the growth till puberty in the humans?
How is ‘oogenesis’ markedly different from ‘spermatogenesis’ with respect to the growth till puberty in the humans?
In a plant tallness is dominant over dwarfness and red flower is dominant over white. Starting with the parents work out a dihybrid cross. What is standard dihybrid ratio? Do you think the values would deviate if the two genes in question are interacting with each other?
Comment on the following diagrams: A, B, C, D, G, P, Q, R, S are species.
- Given below is the TS of human ovary. Identify the following in the diagram:
- Corpus luteum.
- Secondary oocyte.
- Antrum.
- Primary follicle.
- Primary oocyte.
- Explain the changes the primary oocyte undergoes while in different follicular stages before ovulation.
List the three different allelic forms of gene “I” in humans. Explain the different phenotypic expressions, controlled by these three forms.
Discuss transgenic animals. Explain any four ways in which such animals can be beneficial for humans.
- Work out a cross upto F, generation between two pure-bred pea plants, one bearing violet flowers and the other white flowers.
- Name this type of cross.
- State the different laws of Mendel that can be derived from such a cross.
Describe in sequence the events that lead to the development of a 3-celled pollen grain from microspore mother cell in angiosperms.